BUSY FROM SUNSET TO SUNRISE 



3.3 



fanner by the destruction of mammal and insect pests. In- 

 asmuch as their regular working hours are from sunset to 

 sunrise, they wage successful war on the nocturnal mammals 

 which remain quiet during the daytime in order to escape 



hawks and other daylight enemies. 



SKELETON OF A BIRD OF PREY. (BALD EAG1 



i i pper mandible. 

 2 Lower mandible. 

 3. Hyoid. 

 i External nostril. 

 3. Orbit. 



6. Occiput. 



7. Cert leal vertebrae 

 B < i:i\ Icles. 



'.i. < Joracold. 



It). I'lua. 



51. Digits ol' loot. 



II Radius. 



12. Carpals. 



13. Metacarpals. 



I I. \)\m\k. 

 Sternum. 



16. Kill of sternum. 



17. Pelvis 

 i^ Fibula. 

 19 Tibia. 



20. Tarsus. 



